Folks,
Not sure where the binaries of pmacct (pmacctd 0.14.1-cvs) as part of the current VyOS 1.1.7 (helium) come from, but I expect they've been compiled without IPv6 support turned on (as was the default originally). Later versions of pmacct come with it turned on by default, which would be nice to have in 1.1.8 if it isn't already.
Thanks,
Ben.